Default sgh-t849 internal gps upgrade

im going to be using my tablet as a in-dash head unit for my car

i seen this http://forum.xda-developers.com/show....php?t=1783196

i was wondering if the same setup is in the sgh-t849.. i would look to see but i need to replace the screen so i wanna replace the screen and add a stronger antenna at same time

or could i get a y splitter for usb to connect to my charging cable with 1 being a female end and connect a usb external antenna....??

~Fuzzy